include/minix/btrace.h

   1 #ifndef _MINIX_BTRACE_H
   2 #define _MINIX_BTRACE_H
   3
   4 /* Control directives. */
   5 enum {
   6   BTCTL_START,
   7   BTCTL_STOP
   8 };
   9
  10 /* Request codes. */
  11 enum {
  12   BTREQ_OPEN,
  13   BTREQ_CLOSE,
  14   BTREQ_READ,
  15   BTREQ_WRITE,
  16   BTREQ_GATHER,
  17   BTREQ_SCATTER,
  18   BTREQ_IOCTL
  19 };
  20
  21 /* Special result codes. */
  22 #define BTRES_INPROGRESS        (-997)
  23
  24 /* Block trace entry. */
  25 typedef struct {
  26   u32_t request;                /* request code; one of BTR_xxx */
  27   u32_t size;                   /* request size, ioctl request, or access */
  28   u64_t position;               /* starting disk position */
  29   u32_t flags;                  /* transfer flags */
  30   i32_t result;                 /* request result; OK, bytes, or error */
  31   u32_t start_time;             /* request service start time (us) */
  32   u32_t finish_time;            /* request service completion time (us) */
  33 } btrace_entry;                 /* (32 bytes) */
  34
  35 /* This is the number of btrace_entry structures copied out at once using the
  36  * BIOCTRACEGET ioctl call.
  37  */
  38 #define BTBUF_SIZE      1024
  39
  40 #endif /* _MINIX_BTRACE_H */